/Engine/Plugins/FX/Niagara/Source/NiagaraEditor/Public/Widgets/SNiagaraParameterPanel.h
static [TSharedRef](API\Runtime\Core\Templates\TSharedRef)< [SExpanderArrow](API\Runtime\Slate\Widgets\Views\SExpanderArrow) > CreateCustomActionExpander ( const struct [FCustomExpanderData](API\Editor\GraphEditor\FCustomExpanderData) & ActionMenuData )